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Preparation of neodymium‐doped LiMnPO 4 /C cathode by sol‐gel method with excellent electrochemical performance for lithium‐ion batteries
Author(s) -
Zhang Jun,
Luo ShaoHua,
Sui LiLi,
Ren QunXiang,
Qin Yan,
Zhang DaJun
Publication year - 2021
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.6546
Subject(s) - neodymium , materials science , scanning electron microscope , electrochemistry , analytical chemistry (journal) , lithium (medication) , cyclic voltammetry , dielectric spectroscopy , cathode , doping , lithium ion battery , chemistry , battery (electricity) , composite material , chromatography , electrode , optics , laser , optoelectronics , power (physics) , quantum mechanics , medicine , physics , endocrinology
Summary The porous spherical structure neodymium‐doped LiMn 1− x Nd x PO 4 /C nanoparticles have been prepared through glycolic acid‐assisted sol‐gel method. The neodymium‐ion doping effect on the crystalline microstructure, crystal appearance, and electrochemical parameters of LiMnPO 4 /C cathodes have been detected by X‐ray diffractometer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), charge and discharge test, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) method. XRD patterns show that a proper amount of neodymium‐ion doping could not change the host crystal structure; combined with EDS spectra, we could conclude that Nd 3+ has successful embedding into the lattice structure of LiMnPO 4 / C . SEM analysis shows that the LiMn 0.94 Nd 0.06 PO 4 /C sample has the uniform and fine particles diameter distribution in comparison with other doped samples. The electrochemical measurement results indicate that the LiMn 0.94 Nd 0.06 PO 4 /C has the initial discharge specific capacity of 155.2 mAh/g at 0.05 C discharge rate; after 200 cycles, the capacity value reduces slightly to 138.7 mAh/g, the capacity retention rate is maintained at 89.4%. The LiMn 0.94 Nd 0.06 PO 4 /C has high‐rate discharge performance with the specific capacity value of 128.0 mAh/g (10 C). The results conclude that a proper amount of neodymium‐ion doping ratio could effectively enhance the lithium‐ion diffusivity and improve high‐rate performance of LiMnPO 4 cathode materials.